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The speed of the bus reflects how many bits of information can be sent across each wire each second. This would be analogous to how fast the cars are driving on our analogical highway. :^) Most buses transmit one bit of data per line, per clock cycle, although newer high-performance buses like AGP may actually move two bits of data per clock cycle, doubling performance. Similarly, older buses like the ISA bus may take two clock cycles to move one bit, halving performance.
Next: Bus Bandwidth